Pierce, W.G., James Williams, and W.H. Courtier. “Geology and Coal Resources of the Southeastern Kansas Coal Field in Crawford, Cherokee, and Labette Counties With a Report on Pennsylvanian Invertebrate Faunas of Southeastern Kansas”. Bulletin (Kansas Geological Survey), no. 24 (January 1, 1938): 1–122. Accessed January 5, 2026. https://journals.ku.edu/kgsbulletin/article/view/21794.